" Mr. Carney said the Secret Service and the White House were following their normal mail-processing procedures, which include screening letters and sending suspicious items to a remote location for "more intense testing.

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But with reading e-mail on our smartphone or tablet becoming the New Normal , not the exception, Roth suggests what you actually need is an e-mail signature for the increasingly-special cases when you are actually desk-bound, reading Microsoft Outlook.

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"Even with the new normal of being informal, the proper way to start an e-mail is with 'Dear, '" said Cynthia Lett, director of the Lett Group, a protocol training company in Silver Spring, Maryland.

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